from python_baway.common.xcommon import sv

balls = []

for i in range(3):
    sv(balls)
    # n = input(f'Plz input the #{i+1} number:')
    n = i + 1
    balls.append(n)
sv(balls)

balls.insert(1, 'a')
sv(balls)

balls.extend(range(1, 4))
sv(balls)

del balls[0]
sv(balls)

del balls[3]
sv(balls)